forked from LBRYCommunity/lbry-sdk
138 lines
4.7 KiB
Python
138 lines
4.7 KiB
Python
# pylint: skip-file
|
|
import binascii
|
|
import logging
|
|
from lbrynet.core.cryptoutils import get_lbry_hash_obj, verify_signature
|
|
from twisted.internet import defer, threads
|
|
from lbrynet.core.Error import DuplicateStreamHashError, InvalidStreamDescriptorError
|
|
from lbrynet.lbrylive.LiveBlob import LiveBlobInfo
|
|
from lbrynet.interfaces import IStreamDescriptorValidator
|
|
from zope.interface import implements
|
|
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
LiveStreamType = "lbrylive"
|
|
|
|
|
|
def save_sd_info(stream_info_manager, sd_info, ignore_duplicate=False):
|
|
log.debug("Saving info for %s", str(sd_info['stream_name']))
|
|
hex_stream_name = sd_info['stream_name']
|
|
public_key = sd_info['public_key']
|
|
key = sd_info['key']
|
|
stream_hash = sd_info['stream_hash']
|
|
raw_blobs = sd_info['blobs']
|
|
crypt_blobs = []
|
|
for blob in raw_blobs:
|
|
length = blob['length']
|
|
if length != 0:
|
|
blob_hash = blob['blob_hash']
|
|
else:
|
|
blob_hash = None
|
|
blob_num = blob['blob_num']
|
|
revision = blob['revision']
|
|
iv = blob['iv']
|
|
signature = blob['signature']
|
|
crypt_blobs.append(LiveBlobInfo(blob_hash, blob_num, length, iv, revision, signature))
|
|
log.debug("Trying to save stream info for %s", str(hex_stream_name))
|
|
d = stream_info_manager.save_stream(stream_hash, public_key, hex_stream_name,
|
|
key, crypt_blobs)
|
|
|
|
def check_if_duplicate(err):
|
|
if ignore_duplicate is True:
|
|
err.trap(DuplicateStreamHashError)
|
|
|
|
d.addErrback(check_if_duplicate)
|
|
|
|
d.addCallback(lambda _: stream_hash)
|
|
return d
|
|
|
|
|
|
def get_sd_info(stream_info_manager, stream_hash, include_blobs):
|
|
d = stream_info_manager.get_stream_info(stream_hash)
|
|
|
|
def format_info(stream_info):
|
|
fields = {}
|
|
fields['stream_type'] = LiveStreamType
|
|
fields['stream_name'] = stream_info[2]
|
|
fields['public_key'] = stream_info[0]
|
|
fields['key'] = stream_info[1]
|
|
fields['stream_hash'] = stream_hash
|
|
|
|
def format_blobs(blobs):
|
|
formatted_blobs = []
|
|
for blob_hash, blob_num, revision, iv, length, signature in blobs:
|
|
blob = {}
|
|
if length != 0:
|
|
blob['blob_hash'] = blob_hash
|
|
blob['blob_num'] = blob_num
|
|
blob['revision'] = revision
|
|
blob['iv'] = iv
|
|
blob['length'] = length
|
|
blob['signature'] = signature
|
|
formatted_blobs.append(blob)
|
|
fields['blobs'] = formatted_blobs
|
|
return fields
|
|
|
|
if include_blobs is True:
|
|
d = stream_info_manager.get_blobs_for_stream(stream_hash)
|
|
else:
|
|
d = defer.succeed([])
|
|
d.addCallback(format_blobs)
|
|
return d
|
|
|
|
d.addCallback(format_info)
|
|
return d
|
|
|
|
|
|
class LiveStreamDescriptorValidator(object):
|
|
implements(IStreamDescriptorValidator)
|
|
|
|
def __init__(self, raw_info):
|
|
self.raw_info = raw_info
|
|
|
|
def validate(self):
|
|
log.debug("Trying to validate stream descriptor for %s", str(self.raw_info['stream_name']))
|
|
hex_stream_name = self.raw_info['stream_name']
|
|
public_key = self.raw_info['public_key']
|
|
key = self.raw_info['key']
|
|
stream_hash = self.raw_info['stream_hash']
|
|
h = get_lbry_hash_obj()
|
|
h.update(hex_stream_name)
|
|
h.update(public_key)
|
|
h.update(key)
|
|
if h.hexdigest() != stream_hash:
|
|
raise InvalidStreamDescriptorError("Stream hash does not match stream metadata")
|
|
blobs = self.raw_info['blobs']
|
|
|
|
def check_blob_signatures():
|
|
for blob in blobs:
|
|
length = blob['length']
|
|
if length != 0:
|
|
blob_hash = blob['blob_hash']
|
|
else:
|
|
blob_hash = None
|
|
blob_num = blob['blob_num']
|
|
revision = blob['revision']
|
|
iv = blob['iv']
|
|
signature = blob['signature']
|
|
hashsum = get_lbry_hash_obj()
|
|
hashsum.update(stream_hash)
|
|
if length != 0:
|
|
hashsum.update(blob_hash)
|
|
hashsum.update(str(blob_num))
|
|
hashsum.update(str(revision))
|
|
hashsum.update(iv)
|
|
hashsum.update(str(length))
|
|
if not verify_signature(hashsum.digest(), signature, public_key):
|
|
raise InvalidStreamDescriptorError("Invalid signature in stream descriptor")
|
|
|
|
return threads.deferToThread(check_blob_signatures)
|
|
|
|
def info_to_show(self):
|
|
info = []
|
|
info.append(("stream_name", binascii.unhexlify(self.raw_info.get("stream_name"))))
|
|
return info
|
|
|
|
def get_length_of_stream(self):
|
|
return None
|